2.Use of pesticides and weedicides . These chemicals dissolve in water and are washed into water bodies from the fields. They also seep into the ground to pollute ground water.

3. The bacteria present in the faeces of mammals.

4. Throwing untreated sewage directly into rivers.

Water which is suitable for drinking is called potable water.

water can be made

safe for drinking:

1. By filtering water. A popular household filter is a candle type filter.
2. By boiling Water.Boiling kills the germs present in the water
3. Chlorination is a commonly used chemical method for purifying water.It is done by adding chlorine tablets or bleaching powder to the water

WHAT YOU HAVE LEARNT

Water pollution is the contamination of water by substances harmful to life.

Sewage, agricultural chemicals and industrial waste are some of the major contaminants of water.

Water which is purified and fit for drinking is known as potable water.